It's always interesting, regarding technical discussions, the nomenclature being used! What I'm getting at is, more times than not people will use a particular word or phrase to describe something and in actuality they are using the wrong descriptive word (nomenclature), even though they are correct about the topic they are discussing. So, what happens to the discussion? It usually turns into a lengthy debate because the people in the discussion are actually saying the same thing but using the wrong words to describe something. Now, I'm not saying this discussion is going that way, but thought it would be appropriate to bring up this bit of information for better future discussions. The definition "backpressure" is one of those words that seems to be over used in discussions regarding exhaust systems and is likely selected to describe a particular phenonema that is not fully understood by the individual trying to describe it. So, for the techie tip of the day.....learn and use proper nomenclature when dicussing technical issues. What do you all think? Sorry for the sidetrack!